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From: Takashi Yano <tyan0@sourceware.org>
To: cygwin-cvs@sourceware.org
Subject: [newlib-cygwin] Cygwin: pty: Fix Ctrl-C handling for non-cygwin apps
 in background.
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https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=e91ea41ef1be3d3e52c451c7bd691e0c2b7de910

commit e91ea41ef1be3d3e52c451c7bd691e0c2b7de910
Author: Takashi Yano <takashi.yano@nifty.ne.jp>
Date:   Sun Dec 12 21:20:47 2021 +0900

    Cygwin: pty: Fix Ctrl-C handling for non-cygwin apps in background.
    
    - With pseudo console enabled, if the non-cygwin app is started in
      the background and put it into the foreground, the process cannot
      be stopped by Ctrl-C. This patch fixes the issue.

Diff:
---
 winsup/cygwin/fhandler_tty.cc | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/winsup/cygwin/fhandler_tty.cc b/winsup/cygwin/fhandler_tty.cc
index 4f135839d..37e27f34a 100644
--- a/winsup/cygwin/fhandler_tty.cc
+++ b/winsup/cygwin/fhandler_tty.cc
@@ -2249,9 +2249,12 @@ fhandler_pty_master::write (const void *ptr, size_t len)
 			  &mbp);
 	}
 
-      if ((ti.c_lflag & ISIG) && !(ti.c_lflag & NOFLSH)
-	  && memchr (buf, '\003', nlen))
-	get_ttyp ()->discard_input = true;
+      if ((ti.c_lflag & ISIG) && memchr (buf, '\003', nlen))
+	{
+	  get_ttyp ()->kill_pgrp (SIGINT);
+	  if (!(ti.c_lflag & NOFLSH))
+	    get_ttyp ()->discard_input = true;
+	}
       DWORD n;
       WriteFile (to_slave_nat, buf, nlen, &n, NULL);
       ReleaseMutex (input_mutex);